Release 0.7.2 changed some of calibre's non-python support components. If you run from source and update the source to 0.7.2 (or later), lots of exceptions will be thrown until you upgrade the binary installation to 0.7.2.

Release 0.7.2 changed some of calibre's non-python support components. If you run from source and update the source to 0.7.2 (or later), lots of exceptions will be thrown until you upgrade the binary installation to 0.7.2.